Press



Feb; 12 1924.

1,483,126 H. SLATER PRESS Filed Jan. 2'7 1919 4 Sheets-Sheet 1 Feb. 12, 1924.- 1,483,126 H. SLATER PRESS Filed Jan. 27 1919 4 Sheets-Sheet 5 M 5 Hard? 5mm? Feb. 12, 19234; 1 RASSJZfi H. SLATER PRESS Filed Jan 27, 1919 4 Sheets-Sheet 4 Patented Feb. 12, 1924.

narrate stares Parana" ori ice.

HARVEY SLATER, 01E CHICAGO, ILLINOIS, ASSIGNOR T CHARLES F. ELMES EN- GINEERING WORKS, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

PRESS.

Application filed January 211919. Serial No. 273,350.

' erence to a press construction wherein provision is made for synchronizing the operation of a pressure-fluid-operated press proper and its automatically actuated, con trol valve under all variations of speed, and for the control of the valve action by means of a predetermined attained pressure in the press itself, whereby to insure at all times and under all conditions a uniformity of operation and resultant product.

While the novel features of the press assemblage constituting the invention are susceptible of modification within a wide range to adapt the same to different types of presses, I have chosen to illustrate and describe the invention as embodied, byway of example, in a quick-acting hydraulic press for forming articles from pulverized material, wherein it is important that the material shall be subjected to a predetermined pressure and also where economy of production requires high speed of operation.

Heretofcre it has been usual, insuch situations, to employ manually actuated pressure fluid valve and a pressure gage to enable the operator to time the valve operation to reverse the press when such required pressure has been obtained. It has also been proposed to utilize as a source of power, pressure fluid intermittently supplied as by a pump, the pump being stopped automatically when the pressure in the system builds up to a predetermined point. According to the present invention, the press having a valved connection to a source of fluid maintained under pressure, such as an accumulator or other reservoir independent of the press operation, the valve is automatically actuated when the predetermined pressure within the press is reached, opening the exhaust and reversing the press, discharging the formed article, feeding a fresh supply of material to the ma triX, introducing again the pressure fluid, compressing the material until the required degree of pressure is again reached, and thus in cycle. The invention thus insures a uniform product and fully synchronized operation, without the employment of manual labor other than a general supervision of several such presses by a single operative.

As an exemplary basis for the detailed description of the invention to follow, reference is had to the accompanying drawings in which- Fig. 1 is a front elevation of a bodyingthe invention;

' Fig. 2 is a side view of the same; I Fig. 3 is a side view from the opposite dlrection;

Fig. 4 is a longitudinal sectional. view through the automatic valve employed;

Fig. 5 is an enlarged detail of the valveactpating mechanism adjacent the valve; an

Fig. 6 is a sectional plan view on the line 6-6 of Fig. 5.

Having more particular reference to Figs. 1, 2 and 3 of the drawings, the press is shown as mounted upon a standard 11 and comprising, generally, a pressure cylinder 12 supplied with pressure fluid through the pipe 13, the cooperating piston 14:, the cross head 15, the plunger die 16, the matrix 17 the pressure gage 18, fluid pressure control valve 19, the piston 14 being retracted during the exhaust period by means of counter springs or pneumatic pressure device housed within the pillars 20 and acting through the cross head 15. The general press assemblage thus far described is of known construction.

A feed hopper for the material to be acted upon is indicated at 21provided in its lower press emportion with arr-agitator 22 by means of A which the material is discharged through the lower open end of the hopper into an open bottom carrier 23 having attached theretoat one end a cord 24 passing around a pulley 25 and counterweighted at 26; the carrier 23 near its center is connected by means of a link 27 with one arm 28 of an angle lever pivoted at 29 the other arm of which 30 is provided with a bearing block 81 through which plays the rod 32 secured to the cross head 15 at 33, lock nuts 3 1- effecting an adjustable connection between the lever arm 30 and the rod 32.

By means of the mechanism last described,

of the carrier lies beneath the outlet from the hopper and closes the same. The material dropped from the-pocket '23 of the carrier falls into the matrix17 and,as'the plunger die 16descends, the rod 32 travels downwardrelieving the arm ofthe angle lever from engagement with the nut 34, permitting the counterweight 26 by; means of the cord 24 to draw the carrier-23m the left as shown in Fig. 3, orfto the right as shown in Fig. 2 to the position shown in the latter figure, with the pocket 23? be neath the open end of the hop er,-torec eive another load of materiah demeaning to descend,.the cross-head 15 carries the rod 32 farther down causing the lock nut34 to leave the bearing block 31, the dieen'tering the matrix and compressing the material therein.

Mounted upon the cross-head 15 is a spring catch 35held in the position shown in Fig. 3 by means of a wedge pin 36, which pin 36 is held in adjusted position by means of the set screw 37. As the-cross-fhead' 15 descends, the catch 35 passes out of engage ment with the wedge pin 36 and is caused byits spring 38 to snap into the notch 39 of the rod 40 which'is at its lower end mounted in a bearing block 41 upo'nxthe arm 42'and the rock shaft 43 (F '3), and upon this rock. shaft 43 is fixed another arm 44 (Figs. 1 and 2) the extremity of which bears beneath the lower end of an ejector rod 45 carrying at its upper end an ejector pin 46 headed at 47 to form the movable bottom of the matrix 17.

When the plunger die 16 has compressed thematerial within the matrix 17 and begins its reverse stroke, the engagement of the catch 35 within the notch 39 of the rod 40 lifts the latter, rocking the arms 42 and 44 on the shaft 43 and lifting the ejector rod 45 andpin 46, discharging the'formed article above the upper surface of the matrix in thepath of the carrier 23 as the latter moves from the position shown in Fig. 2 tothat shown in Fig. 3, the carrier wiping the formed article off the platen to any suitable point of discharge. The position of the wedge pin 36 is so adjusted as to retract thecatch 35 from the'notoh 39 at the-instantthe formed article reaches the level of the platen in front of the carrier, where upon the rod 40 drops-and with it the ejector pin 46 to the position shown in Fig. 1, ready for the charging of the matrix with material as the pocket 23 of the carrier again reaches a position over the matrix.

A description of the means whereby the movements of the press are accomplished is now in order: While in a fluid pressure press of this type various forms of control valves might be so modified as to embody the present invention, I have shown, for pur poses of illustration, the invention as embodied in that form of high-pressure valve patented on June 15, 1915 to me and numbered 1,143,236. The only material modification ofthat valve, is such as to enable it to be operated automatically by the press, under the control of built-up pressure therein, fand tosynchronize the operation 01 the valve precisely with that 01 the press. This valve, indicated generally at 19 in the draw ings, is shown in detail in Fig. 4.

The inlet of pressure fluid to the valve casing 19 is through the supply pipe 48 and the exhaustat 49, while the port for supply of pressure fluid to the press or the return therefrom to the exhaust is shown at 50. The bore of the casing 19between the inlet 48an'd the supply port 50 has an apertured partition 51 forming a guide and seat for the inlet controlling valve 52 which valve is guided in the plug 53 and acted upon by the compression spring 54 tending to maintain the same in closed position. The portion of the bore oi'the casing between the port 50 and the exhaust 49 is restricted to form a shoulder 55 and disposed in this portion of the boreis a guiding sleeve 56 bearing upon a packing 57 positioned between the sleeve and shoulder. Slidably mounted in the sleeve and adapted to be brought into engagement with the valve 52 is a floating piston-plug 58 having a bore 59 extending therethrough and adapted to place the port 50 in fluid communication with the outlet or exhaust 49. The sleeve 56 provides a shoulder at 60 forming a stop for the upward movement of the piston 58. Slidably mounted within the sleeve 56 above the piston 58 is a rod 61 pivoted at its upper end to toggle links 62, 63, the link 63 being pivoted at 64 to the cross bars 65 of a yoke the side members 66 of which rigidly upstand from the valve casing. A lever 67 is tulcrumed at 68 in the said yoke and from its pivot pin extends at right angles an arm 69 connected by a link 70 to the breaking point of the toggle at 71. One arm of the lever 67 is counterweighted at 72 and has pivoted thereto at 73 a rod 74 which extends upwardly alongside the press and is hooked over in apertured engagement at 75 with a stationary rod 76 adjustably mounted on the press by a set collar 77. his rod 76 carries (a collar 78 forming the lower abutment for a compression spring 79 and having'an' extension 80 for adjustably holding byuneans of the set screw 81 a tappet 82.

The compression spring 79 surrounds the rod 76 and underlies the overturned end of the rod 7 1. The pivoted dog 83 counterweighted at 841 rests normally under the influence of the counterweighted end with a hooked portion against the side of a plate 85 mounted on the rod 74, and is adapted upon the descent of the rod 7 1 to take over the upper edge of the plate 85 and hold it in a depressed condition until released by the tappet pin 82 as will be hereafter described.

The press-supply pipe 50 leading from the valve terminates in a coupling 86 one branch of which connects with the fluid pressure supply pipe 13 and another branch to a pipe 87, elbow 88, and riser pipe 89 the upper end of which pipe 89 is provided with a blowoff or pop-valve 90 which is normally controlled by the weighted restraining arm 91 pivoted at 92 to the bracket 93 and counterweighted at 94-, this counterweight being adjustable in order to vary the pressure holding the pop-valve 90 closed. A link rod 95 pivoted at 96 to the lever arm 91 is slidable at its lower end in the tail 97 of a dog 98 the lower beveled hooked end of which is adapted to engage over a stud 99 carried by the lever arm 67 When it is desired to start the press which is standing idle the operator bears down upon the lever 67 (Fig. 5) straightening the toggle 6263 and bringing the stud 99 into engagement with the dog 98 whereby it is held in this elevated position. The plunger rod 61 is thus caused to bear downward upon the floating piston 48 opening the inlet valve 52 and permitting the pressure fluid to flow from the accumulator or reservoir by way of the pipe 48 through the valve to the supply port 50 and thence through the pressure supply pipe 13 to the press cylinder above the piston and likewise through the pipes 8789 to a point below the pop-valve 90. This causes the piston 14, the cross head 15 and th plunger die 16 to descend, the descent of the rod 32 pennitting the angle lever 2829 to give and the counterweight 26 by means of the cord 27 to draw the shuttle carrier into position for a new supply of material as shown in Fig. 2. The open connection between the inlet pipe 48 through the valve to the press-supply pipe 50 permits the pressure to build up within the cylinder above the piston, said pressure being visually indicated by the gauge 18 connected with the supply pipe 13, until that predetermined pressure is attained for which the pop-valve is set by the adjustment of the weight 94. As soon as this pressure is obtained within the cylinder and upon material within the matrix 17, the pop valve 90 rises, lifting the leverarm 91, and disconnecting by means of the rod 95 the dog 98 from the stud 99, permitting the lever 67 counterweighted at 72 to drop, breaking the toggle 6263 as shown in Fig. 5 and lifting the plunger-rod 61, thus permitting the valve 52 to close and shut off the supply of pressure fluid from the pipe 18, the back pressure at 50 lifting the floating piston 58 but leaving a passage through the port 59 at the valve seat 60 with the exhaust 19. A communication being thus established between the cylinder space above the piston and the exhaust, the piston 141, the cross head 15 and the plunger die 16 are raised by means of the spring or pneumatic devices within the pillars 20. Simultaneously, the rod 420 is lifted by its engagement with the catch 35 and the ejector pin 46 lifts the formed article to the upper level of the press platen while the rod 32 rocks the shaft29, moving the carrier 23 across the matrix to sweep the formed article therefrom and to discharge a new load of material into the matrix. At the same moment the wedge pin 36 disengages the catch 35 from the rod 40 and permits the ejector pin to drop. As the piston of the press reaches its uppermost position, the cross head 15 by means of its guiding collar 100 carries upwardly the set collar 77 attached to the rod 76, thus lifting the rod 76 and strongly compressing the spring 79 beneath the overturned end 7 5 of the rod 7 1. This continues until the tappet 82 strikes the tail 84 of the dog releasing the hook 83 from the plate 85, whereupon the compressed spring 7 9reacts to force the rod 74 upward, lifting the weighted end of th lever 67 and effecting 3 again an engagement between its stud 99 and the dog 98, thereby breaking the toggle 62-63, depressing the plunger rod 61 closing the communication between the press supply port 50 and the exhaust and again opening a communication between the inlet pipe 418 and the said press supply port 50, and thus'in cycle.

it will thus be observed that whether the press acts more slowly or more rapidly, dependent upon the pressure fluid supply, the valve will not be shifted to reverse the movement of the press until the pressure within the press cylinder and consequently upon the article being formed has built up to the required degree, as predetermined by the ad justment of the weight 9 1 upon the lever 91 controlling the pop-valve'90; that as soon as such predetermined pressure is reached, the valve acts automatically and quickly without the intervention of any operative to reverse the press, to discharge the formed article to supply to the matrix other material, and to again reverse the action of the press to effect the forming of another article. L

There is thus attained a precise synchronizing of the valve and the press regardless of variations in speed of operation and also a control of the valve actuation by means of th conditions present in the press as defined in terms of pressure upon the articles being formed. A, single operative can supervise the operation of a battery of presses all of which, having once been set in motion, continue to function with precision and without farther attention. All that is required to stop the operation of a press, at the end of a job or to effect adjustment, is to move the lever 67 momentarily to an intermediate position, whereby to establish communication for the time being directly between the inlet port of the valve and the exhaust. I I

As previously intimated, it will now be obvious that the invention is susceptible of embodiment in connection with various types of presses and valves, and such necessary modification of constructional details and assemblage as will readily suggest themselves to persons skilled in the art under changed conditions, all without material departure from the invention as seto'ut in connection with this preferred embodiment. It will be seen therefore that this detailed description and drawings upon which it is predicated are tobe taken in an illustrative and not in an unnecessarily limiting sense.

I claim:

1. The combination with a continuous pressure fluid operated press, and a control valve therefor, of a connection between the press and valve whereby to synchronize the operation of the press and valve under all variations in speed of press operation.

2. The con'ibination with a continuous pressure fluid operated press, and a control valve therefor comprising inlet, press and exhaust ports and a valve plug to connect the press port alternatively with the supply and exhaust, of a connection between the press and valve whereby to synchronize the operation of the press and valve under all variations in speed of press operation.

3. The combination with a pressure fluid operated press, and a control valve therefor comprising inlet, press and exhaust ports and a valve plug to connectthe press port alternatively with the supply and exhaust, of a connection between the press and valve whereby to synchronize the operation of the press and valveunder all variations in speed of press operation, said connection co-mprising mechanism for shifting the valve plug, an actuating rod therefor, gravital means for moving the rod in the direction of press reversal, a detent to hold the rod in re versal position, a spring bearing on the rod in a diection opposed to gravity, an abut- I ment for the spring disposed in the path of a moving part of the press whereby to compress the spring as the press reverses, a tappet actuated by the movement of the press near its reverse limit to disengage the detent, whereby'the stressed spring thereupon effects the movement of the actuating rod against gravity to shift the valve plug and start the press in'its work stroke and as the spring abutment is relieved from the action of the press the unstressed spring permits gravityto move the actuating rod in the opposite direction to shift the valve plug and again reverse the press.

4. The combination with a continuous pressure fluid operated press, and a pressure fluid control valve, of means under the con trol of the head of pressure in the press'to actuate the valve'whereby the valve will be automatically timed to reverse the press movement when the pressure exerted thereby reaches a predetermined degree.

5. The combination with a continuous pressure fluid operated press. and a control valve therefor comprising inlet, press ano exhaust ports and a valve plug to connect the press port alternatively with the supply and exhaust. of means under the control of thejheadof pressure in the press to actuate the valve whereby the valve will be automatically actuated to connect the press with the exhaust port and to reverse the press when the pressure exerted thereby reaches a predetermined degree.

6. The combination with a continuous pressure fluid operated press, and a control valve therefor comprising inlet, press and exhaust-ports and a valve plug to connect the press port alternatively with the supply and exhaust, of means under the control of the head of pressure in the press to actuate the valve whereby the valve will be auto matically actuated to connect the press with the exhaust port and to reverse the press when the pressure exerted thereby reaches a predetermined degree, said means comprising a movable member subject to the pressure within the press, yielding restraining means tending to hold the said member stationary, and a connection between the restraining means and the valve plug whereby when the said member is moved by built up pressure within the press the valve plug will be moved to connect the press with the exhaust port.

7. The combination with a pressure fluid operated press, and a control valve therefor comprising inlet, press and exhaust ports and a valve plug to connect the press port alternatively with the supply and exhaust, of means under the control'of the head of pressure in the press to actuate the valve whereby the valve will be automatically acmated to connect the press with the exhaust port and to reverse the press when the pres sure exerted thereby reaches a predetermined degree, said means comprising a popvalve subject to the pressure within the press, regulable yielding restraining means tending to hold the pop-valve seated, and a connection between the restraining means and the valve plug whereby when the popvalve is unseated by built-up pressure within the press the valve plug will be moved to connect the press with the exhaust port.

8. The combination with a pressure fluid operated press, and a control valve therefor comprising inlet, press and exhaust ports and a valve plug to connect the press port alternatively with the supply and exhaust, of means under the control of the head of pressure in the press to actuate the valve whereby the valve will be automatically actuated to connect the press with the exhaust port and to reverse the press when the pressure exerted thereby reaches a predetermined degree, said means comprising a popvalve subject to the pressure within the press, a restraining lever'fulcrumed on the pop-valve to hold it seated, a shiftable weight on the lever to vary the action on the pop-valve, and a connection between the restraining lever and valve plug whereby when the pop-valve is unseated by built-up pressure within the press the valve plug will be moved to connect the press with the exhaust port and reverse the movement of the press. a

9. The combination with a pressure fluid operated press, and a control valve therefor comprising inlet, press and exhaust ports and a valve plug to connect the press port alternatively with the supply and exhaust,

of means under the control of the head of in the press to actuate the valve whereby the valve will be automatically actuated to connect thepress with the exhaust port and to reverse the press whenthe pressure exerted thereby reaches a predetermined degree, said means comprising a popvalve subject to the pressure within the press, pop-valve to hold it seated, a shiftable weight on the lever to vary the action on the pop-valve, a toggle arranged when straightened to hold the valve plug in position to maintain the press in communication with the inlet port and notwith thelexhaust port and when broken to shift the valve plug to close the inlet portand connect the press with the exhaust port, and a connection between the toggle and restraining lever whereby when the pop-valve is unseated the toggle will be broken. i Y

10. The combination with a continuous pressure fluid operated press, and a control valve therefor comprising inlet, press and exhaust ports and a valve plug to connect the press port alternatively with the supply and exhaust, of a connection between the press and valve whereby to synchronize the pressure operation of the press and valve under all variations in press operation and to reverse the press when the pressure exerted thereby reaches a predetermined degree a restraining lever fulcrumed on the 11. The combination with a pressure fluid operated press, and a control valve therefor comprising inlet, press and exhaust ports and a valve plug to connect the press port alternatively with the supply and exhaust, of a connection between the press and valve whereby to synchronize the operation of the press and valve under all variations in press operation and to reverse the press when the pressure exerted thereby reaches a predetermined degree, said means comprising valve plug shifting mechanism, an actuating rod therefor, a movable member subject to the pressure within the press, yielding restraining means tending to hold the said member stationary, a connection between the restraining means and the valveactuating rod, said connection being a releasable one whereby upon the movement of the member acted upon by the pressure within the valve in opposition to its restraining means the actuating rod will be moved to a position for reversing the press, a detent carried by the press to hold the rod in reversal position and to lift the rod as the press nears the limit of its reversal stroke to effect reconnection of the actuating rod with the restraining means, and a tappet actuated at the limit of the reversal movement of the press to release the detent whereby to per mit the release of the connection between the actuating rod and the restraining memberwhen the pressure within the press builds up to the predetermined degree.

I 12. The combination with a pressure fluid operated press, and a control valve therefor comprising inlet, press and exhaust ports and a valve plug to connect the press port alternatively with the supply and exhaust, of a connection between the press and valve whereby to synchronize the operation of the press and valve under all variations in press operation and to reverse the press when the pressure exerted thereby reaches a predetermined degree, said connecting mechanism comprising a pop-valve subject to the pressure within the press, a restraining lever fulcrumed on the pop-valve to hold it seated,

at shiftable weight on the lever to vary the I action on the pop-valve, a toggle arranged when straightened to hold the valve plug in position to maintain the press in como munication with the inlet port and not with the exhaust port and when broken to shift the valve plug to .close the inlet port and connect the press with the exhaust port, a weighted lever tending by gravity to break the toggle, a releasable connection between the toggle leverand restraining lever where by when the, pop-valve is unseated the togle will be ,broken and the control valve shifted to efl'ect communication between the press and the exhaust port and to reverse the i press vwhen the pressure exerted thereby reaches a degree predetermined by the adju'stment of the Weight on the restraining lever, a valve-actuating rod connected with the restraining lever and tending by the gravital action thereof to move to a position of reversal, a spring bearing on the rod in a direction opposed to gravity, an abutment for the spring disposed in the path of a moving part of the press whereby to compress the spring as the press reverses, a

detent to hold the rod in reverse position, a

tappet actuated by the movement of the press near is reverse limit to disengage the detent whereby the stressed spring thereupon ettects movement of the actuating rod against gravity to shift the valve plug and start the press on its work stroke and as the spring abutment is relieved from the-action of the press the unstressedspring permits gravity to move the actuating rod in the opposite direction to'shiftthe valve plug and again reverse the press, the action of the stressedspring being to again connect the released connection between the toggle operating lever and the weighted restraining lever.

13. In a press, the combination of a movable die, a cooperating matrix, means to operate the press, a hopper for the material to be compressed, a shuttle carrier mounted to move between the hopper and matrix, yielding means to move the empty carrier from the matrix to the hopper,'and mechanical means synchronized with the movement of the press to move the loaded carrier from the hopperfto the matrix.

14, In 'apress, the'combinationof a movable die, a cooperating matrix, meanstobp erate the press. a hopper forthe materialto be compressed, a shuttle carrier mountedto move between the hopper andmatrix, yielding means to move the empty carrier from the matrix to the hopper, and mechanical means synchronized with the movement of the press to move the loaded carrier from the hopper to the matrix and to eject the formedarticle from the matrix.

15.- In a press, the combination of a movable die, a cooperating matrix, means to opera-tethe press, a hoppertorthematerial to be compressed, a shuttlecarrier mounted to move between the hopper andnnatrix,

yielding means to move the empty carrier from the matrix to the hopper, and mechani cal means synchronized with the move ment of the press to movethe loaded carrierfrom the hopperto'the martix, said lastnamed means comprising arock arm linked to'the carrier, an arm-actu'atingrod connected-at one end to a'movingp'artof' the press and at'the other endto the arm whereby as the press moves in its work strokethe yielding e ele 'vl s m a W be un es r in d and as the pressmoves; 1n

thelroc'k'arm: will b a :t:iiated to m 'lvefthe ca its r ver e. s re n p sie th yennemea 116. In a pressfihecombinatlon of a'mo'vthe press to move the loaded carrier troin the hopper to the matrix, said last named means'comprising an arm linked to the carrier, an arm-actuating rod connected to a moving part of the press at one end and at the otherend to the arm, one point of connection being fixed and the other a sliding connection permitting a relative movement in one direction only, whereby asthe press moves in its workstroke the yielding carrier moving means will be unrestrained and as thepressmoves in its reverse stroke the rock arm will'jbe actuated to move the carrier in opposition to theyielding means.

I17. In a press, the combination of a movable die, a cooperating matrix, means to operate the press, a hopper for the material to becomp'ressed, a shuttle carrier mounted to move between the hopper and matrix, yielding means to move the empty carrier from the matrix to the hopper, and mechanical means synchronized with the movement of the pressto move the loaded carrier from the hopper to the matrix, the last mentioned means. comprising a rock arm linked to the carrier,anjarm actuating rod fixed at its upper end to a movingpart of the press and at its lower'end to the arm, the'point of connectionto the, press being fixed and the. connectionto the arm having a relative movementin one direction only whereby as the press moves in its work stroke the yielding carrier. moving means will be unrestrained and as the press moves in itsreverse stroke the rock arm will be actuated to move the carrier "inopposition to the yielding means.

"18: In a press, the combination of a movabledie, acooperating matrix, means tooperate the press, a hopper for the material to be compressed, and means for charging the matrix from the hopper, of means to eject the formed article from the matrix comprisingan ejector entering the matrix from'below, an actuating'rod connected to the ejecto'rand acted upon'by a moving part of the press in its reverse strokefto operate the ejector to discharge termed articles from the matrix.

19(In a press, the combination of a movabledie, 'a'coo'pera'ting matrix, means to opstate the press, a hopper for the material to becompressed; and means for charging the matrixf from the hopper, of means to eject the formed article tromthematrlx compris the formed article from the matrix comprising an ejector having a head forming the bottom of the matrix, an arm carrying said ejector, an actuating rod connected to the ejector arm, a detent moving with the press and arranged to engage with the actuating rod in the direction of actuation for the ejector, and a detent trip arranged to release the actuating rod upon the completion of the act of ejectment. 1

21. The combination with a continuous pressure fluid operated press, and a control valve therefor comprising inlet, press and exhaust ports and a means to connect the press port alternatively with the supply and exhaust, of a connection between the press and valve whereby to synchronize the operation of the press and valve under all variations in speed of press operations.

22. The combination with a continuous pressure fluid operated press, and a pressure fluid control valve, of means under the control of the head of pressure in the press to actuate the valve whereby the valve will be automatically timed to reverse the press movement immediately when the pressure exerted thereby reaches a predetermined degree.

23. The combination with a continuous pressure fluid operated press, and a control valve therefor comprising inlet, press and exhaust ports and means to connect the press port alternatively with the supply and exhaust, of means under the control of the head of pressure in the press to actuate the valve whereby the valve will be automatically actuated to connect the press with the exhaust port and to reverse the press when the pressure exerted thereby reaches a predetermined degree.

In testimony whereof I have hereunto signed my name in the presence of two subscribing witnesses.

HARVEY SLATER. 

